As a commonly used power output device in home production, three-phase asynchronous motors sometimes show obstacles due to some reasons. Motor manufacturers should grasp common sense of common obstacles to motors, and motor manufacturers inventory three-phase asynchronous motor winding short-circuits for everyone Obstacle detection methods.

　　The three-phase asynchronous motor winding short-circuit environment has inter-turn short-circuit and inter-phase short-circuit.

　　1. Operate the megohmmeter and check the insulation resistance between any two phases with a multimeter. If it is 0.2 megohm or zero at this moment, it means it is a short circuit between the phases. (All wires of the motor lead should be disassembled when checking);

　　2. Separately measure the current of the three-phase winding, the larger current is the short-circuit phase;

　　3. Use a short circuit detector to check the short circuit between the windings;

　　4. Measure the resistance of the three-phase winding with a bridge, and the short-circuit phase is the smallest resistance.

　　5. There is noise when the motor is running

　　Distinguish the main points between the machine department and the electromagnetic department that hinder the division of the motor: first energize the motor and listen to the sound of the operation, then cut off the power, let the motor continue to run by inertia, if the abnormal sound disappears at this time, it means that the motor is electromagnetic Obstacle, otherwise it is an obstacle to the motor machinery.